mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
312 lines
11 KiB
Markdown
312 lines
11 KiB
Markdown
---
|
||
slug: /zh/sql-reference/functions/introspection
|
||
machine_translated: true
|
||
machine_translated_rev: 72537a2d527c63c07aa5d2361a8829f3895cf2bd
|
||
sidebar_position: 65
|
||
sidebar_label: "\u81EA\u7701"
|
||
---
|
||
|
||
# 内省功能 {#introspection-functions}
|
||
|
||
您可以使用本章中描述的函数来反省 [ELF](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) 和 [DWARF](https://en.wikipedia.org/wiki/DWARF) 用于查询分析。
|
||
|
||
!!! warning "警告"
|
||
这些功能很慢，可能会强加安全考虑。
|
||
|
||
对于内省功能的正确操作:
|
||
|
||
- 安装 `clickhouse-common-static-dbg` 包。
|
||
|
||
- 设置 [allow_introspection_functions](../../operations/settings/settings.md#settings-allow_introspection_functions) 设置为1。
|
||
|
||
出于安全考虑，内省函数默认是关闭的。
|
||
|
||
ClickHouse将探查器报告保存到 [trace_log](../../operations/system-tables/trace_log.md#system_tables-trace_log) 系统表. 确保正确配置了表和探查器。
|
||
|
||
## addressToLine {#addresstoline}
|
||
|
||
将ClickHouse服务器进程内的虚拟内存地址转换为ClickHouse源代码中的文件名和行号。
|
||
|
||
如果您使用官方的ClickHouse软件包，您需要安装 `clickhouse-common-static-dbg` 包。
|
||
|
||
**语法**
|
||
|
||
``` sql
|
||
addressToLine(address_of_binary_instruction)
|
||
```
|
||
|
||
**参数**
|
||
|
||
- `address_of_binary_instruction` ([UInt64](../../sql-reference/data-types/int-uint.md)) — 正在运行进程的指令地址。
|
||
|
||
**返回值**
|
||
|
||
- 源代码文件名和行号（用冒号分隔的行号）
|
||
|
||
示例, `/build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.cpp:199`, where `199` is a line number.
|
||
|
||
- 如果函数找不到调试信息，返回二进制文件的名称。
|
||
|
||
- 如果地址无效，返回空字符串。
|
||
|
||
类型: [字符串](../../sql-reference/data-types/string.md).
|
||
|
||
**示例**
|
||
|
||
启用内省功能:
|
||
|
||
``` sql
|
||
SET allow_introspection_functions=1
|
||
```
|
||
|
||
从中选择第一个字符串 `trace_log` 系统表:
|
||
|
||
``` sql
|
||
SELECT * FROM system.trace_log LIMIT 1 \G
|
||
```
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
event_date: 2019-11-19
|
||
event_time: 2019-11-19 18:57:23
|
||
revision: 54429
|
||
timer_type: Real
|
||
thread_number: 48
|
||
query_id: 421b6855-1858-45a5-8f37-f383409d6d72
|
||
trace: [140658411141617,94784174532828,94784076370703,94784076372094,94784076361020,94784175007680,140658411116251,140658403895439]
|
||
```
|
||
|
||
该 `trace` 字段包含采样时的堆栈跟踪。
|
||
|
||
获取单个地址的源代码文件名和行号:
|
||
|
||
``` sql
|
||
SELECT addressToLine(94784076370703) \G
|
||
```
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
addressToLine(94784076370703): /build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.cpp:199
|
||
```
|
||
|
||
将函数应用于整个堆栈跟踪:
|
||
|
||
``` sql
|
||
SELECT
|
||
arrayStringConcat(arrayMap(x -> addressToLine(x), trace), '\n') AS trace_source_code_lines
|
||
FROM system.trace_log
|
||
LIMIT 1
|
||
\G
|
||
```
|
||
|
||
该 [arrayMap](higher-order-functions.md#higher_order_functions-array-map) 功能允许处理的每个单独的元素 `trace` 阵列由 `addressToLine` 功能。 这种处理的结果，你在看 `trace_source_code_lines` 列的输出。
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
trace_source_code_lines: /lib/x86_64-linux-gnu/libpthread-2.27.so
|
||
/usr/lib/debug/usr/bin/clickhouse
|
||
/build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.cpp:199
|
||
/build/obj-x86_64-linux-gnu/../src/Common/ThreadPool.h:155
|
||
/usr/include/c++/9/bits/atomic_base.h:551
|
||
/usr/lib/debug/usr/bin/clickhouse
|
||
/lib/x86_64-linux-gnu/libpthread-2.27.so
|
||
/build/glibc-OTsEL5/glibc-2.27/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:97
|
||
```
|
||
|
||
## addressToSymbol {#addresstosymbol}
|
||
|
||
将ClickHouse服务器进程内的虚拟内存地址转换为ClickHouse对象文件中的符号。
|
||
|
||
**语法**
|
||
|
||
``` sql
|
||
addressToSymbol(address_of_binary_instruction)
|
||
```
|
||
|
||
**参数**
|
||
|
||
- `address_of_binary_instruction` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Address of instruction in a running process.
|
||
|
||
**返回值**
|
||
|
||
- 来自ClickHouse对象文件的符号。
|
||
- 如果地址无效，返回空字符串。
|
||
|
||
类型: [字符串](../../sql-reference/data-types/string.md).
|
||
|
||
**示例**
|
||
|
||
启用内省功能:
|
||
|
||
``` sql
|
||
SET allow_introspection_functions=1
|
||
```
|
||
|
||
从中选择第一个字符串 `trace_log` 系统表:
|
||
|
||
``` sql
|
||
SELECT * FROM system.trace_log LIMIT 1 \G
|
||
```
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
event_date: 2019-11-20
|
||
event_time: 2019-11-20 16:57:59
|
||
revision: 54429
|
||
timer_type: Real
|
||
thread_number: 48
|
||
query_id: 724028bf-f550-45aa-910d-2af6212b94ac
|
||
trace: [94138803686098,94138815010911,94138815096522,94138815101224,94138815102091,94138814222988,94138806823642,94138814457211,94138806823642,94138814457211,94138806823642,94138806795179,94138806796144,94138753770094,94138753771646,94138753760572,94138852407232,140399185266395,140399178045583]
|
||
```
|
||
|
||
该 `trace` 字段包含采样时的堆栈跟踪。
|
||
|
||
获取单个地址的符号:
|
||
|
||
``` sql
|
||
SELECT addressToSymbol(94138803686098) \G
|
||
```
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
addressToSymbol(94138803686098): _ZNK2DB24IAggregateFunctionHelperINS_20AggregateFunctionSumImmNS_24AggregateFunctionSumDataImEEEEE19addBatchSinglePlaceEmPcPPKNS_7IColumnEPNS_5ArenaE
|
||
```
|
||
|
||
将函数应用于整个堆栈跟踪:
|
||
|
||
``` sql
|
||
SELECT
|
||
arrayStringConcat(arrayMap(x -> addressToSymbol(x), trace), '\n') AS trace_symbols
|
||
FROM system.trace_log
|
||
LIMIT 1
|
||
\G
|
||
```
|
||
|
||
该 [arrayMap](higher-order-functions.md#higher_order_functions-array-map) 功能允许处理的每个单独的元素 `trace` 阵列由 `addressToSymbols` 功能。 这种处理的结果，你在看 `trace_symbols` 列的输出。
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
trace_symbols: _ZNK2DB24IAggregateFunctionHelperINS_20AggregateFunctionSumImmNS_24AggregateFunctionSumDataImEEEEE19addBatchSinglePlaceEmPcPPKNS_7IColumnEPNS_5ArenaE
|
||
_ZNK2DB10Aggregator21executeWithoutKeyImplERPcmPNS0_28AggregateFunctionInstructionEPNS_5ArenaE
|
||
_ZN2DB10Aggregator14executeOnBlockESt6vectorIN3COWINS_7IColumnEE13immutable_ptrIS3_EESaIS6_EEmRNS_22AggregatedDataVariantsERS1_IPKS3_SaISC_EERS1_ISE_SaISE_EERb
|
||
_ZN2DB10Aggregator14executeOnBlockERKNS_5BlockERNS_22AggregatedDataVariantsERSt6vectorIPKNS_7IColumnESaIS9_EERS6_ISB_SaISB_EERb
|
||
_ZN2DB10Aggregator7executeERKSt10shared_ptrINS_17IBlockInputStreamEERNS_22AggregatedDataVariantsE
|
||
_ZN2DB27AggregatingBlockInputStream8readImplEv
|
||
_ZN2DB17IBlockInputStream4readEv
|
||
_ZN2DB26ExpressionBlockInputStream8readImplEv
|
||
_ZN2DB17IBlockInputStream4readEv
|
||
_ZN2DB26ExpressionBlockInputStream8readImplEv
|
||
_ZN2DB17IBlockInputStream4readEv
|
||
_ZN2DB28AsynchronousBlockInputStream9calculateEv
|
||
_ZNSt17_Function_handlerIFvvEZN2DB28AsynchronousBlockInputStream4nextEvEUlvE_E9_M_invokeERKSt9_Any_data
|
||
_ZN14ThreadPoolImplI20ThreadFromGlobalPoolE6workerESt14_List_iteratorIS0_E
|
||
_ZZN20ThreadFromGlobalPoolC4IZN14ThreadPoolImplIS_E12scheduleImplIvEET_St8functionIFvvEEiSt8optionalImEEUlvE1_JEEEOS4_DpOT0_ENKUlvE_clEv
|
||
_ZN14ThreadPoolImplISt6threadE6workerESt14_List_iteratorIS0_E
|
||
execute_native_thread_routine
|
||
start_thread
|
||
clone
|
||
```
|
||
|
||
## demangle {#demangle}
|
||
|
||
转换一个符号，您可以使用 [addressToSymbol](#addresstosymbol) 函数到C++函数名。
|
||
|
||
**语法**
|
||
|
||
``` sql
|
||
demangle(symbol)
|
||
```
|
||
|
||
**参数**
|
||
|
||
- `symbol` ([字符串](../../sql-reference/data-types/string.md)) — Symbol from an object file.
|
||
|
||
**返回值**
|
||
|
||
- C++函数的名称。
|
||
- 如果符号无效，则为空字符串。
|
||
|
||
类型: [字符串](../../sql-reference/data-types/string.md).
|
||
|
||
**示例**
|
||
|
||
启用内省功能:
|
||
|
||
``` sql
|
||
SET allow_introspection_functions=1
|
||
```
|
||
|
||
从中选择第一个字符串 `trace_log` 系统表:
|
||
|
||
``` sql
|
||
SELECT * FROM system.trace_log LIMIT 1 \G
|
||
```
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
event_date: 2019-11-20
|
||
event_time: 2019-11-20 16:57:59
|
||
revision: 54429
|
||
timer_type: Real
|
||
thread_number: 48
|
||
query_id: 724028bf-f550-45aa-910d-2af6212b94ac
|
||
trace: [94138803686098,94138815010911,94138815096522,94138815101224,94138815102091,94138814222988,94138806823642,94138814457211,94138806823642,94138814457211,94138806823642,94138806795179,94138806796144,94138753770094,94138753771646,94138753760572,94138852407232,140399185266395,140399178045583]
|
||
```
|
||
|
||
该 `trace` 字段包含采样时的堆栈跟踪。
|
||
|
||
获取单个地址的函数名称:
|
||
|
||
``` sql
|
||
SELECT demangle(addressToSymbol(94138803686098)) \G
|
||
```
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
demangle(addressToSymbol(94138803686098)): DB::IAggregateFunctionHelper<DB::AggregateFunctionSum<unsigned long, unsigned long, DB::AggregateFunctionSumData<unsigned long> > >::addBatchSinglePlace(unsigned long, char*, DB::IColumn const**, DB::Arena*) const
|
||
```
|
||
|
||
将函数应用于整个堆栈跟踪:
|
||
|
||
``` sql
|
||
SELECT
|
||
arrayStringConcat(arrayMap(x -> demangle(addressToSymbol(x)), trace), '\n') AS trace_functions
|
||
FROM system.trace_log
|
||
LIMIT 1
|
||
\G
|
||
```
|
||
|
||
该 [arrayMap](higher-order-functions.md#higher_order_functions-array-map) 功能允许处理的每个单独的元素 `trace` 阵列由 `demangle` 功能。 这种处理的结果，你在看 `trace_functions` 列的输出。
|
||
|
||
``` text
|
||
Row 1:
|
||
──────
|
||
trace_functions: DB::IAggregateFunctionHelper<DB::AggregateFunctionSum<unsigned long, unsigned long, DB::AggregateFunctionSumData<unsigned long> > >::addBatchSinglePlace(unsigned long, char*, DB::IColumn const**, DB::Arena*) const
|
||
DB::Aggregator::executeWithoutKeyImpl(char*&, unsigned long, DB::Aggregator::AggregateFunctionInstruction*, DB::Arena*) const
|
||
DB::Aggregator::executeOnBlock(std::vector<COW<DB::IColumn>::immutable_ptr<DB::IColumn>, std::allocator<COW<DB::IColumn>::immutable_ptr<DB::IColumn> > >, unsigned long, DB::AggregatedDataVariants&, std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >&, std::vector<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >, std::allocator<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> > > >&, bool&)
|
||
DB::Aggregator::executeOnBlock(DB::Block const&, DB::AggregatedDataVariants&, std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >&, std::vector<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> >, std::allocator<std::vector<DB::IColumn const*, std::allocator<DB::IColumn const*> > > >&, bool&)
|
||
DB::Aggregator::execute(std::shared_ptr<DB::IBlockInputStream> const&, DB::AggregatedDataVariants&)
|
||
DB::AggregatingBlockInputStream::readImpl()
|
||
DB::IBlockInputStream::read()
|
||
DB::ExpressionBlockInputStream::readImpl()
|
||
DB::IBlockInputStream::read()
|
||
DB::ExpressionBlockInputStream::readImpl()
|
||
DB::IBlockInputStream::read()
|
||
DB::AsynchronousBlockInputStream::calculate()
|
||
std::_Function_handler<void (), DB::AsynchronousBlockInputStream::next()::{lambda()#1}>::_M_invoke(std::_Any_data const&)
|
||
ThreadPoolImpl<ThreadFromGlobalPool>::worker(std::_List_iterator<ThreadFromGlobalPool>)
|
||
ThreadFromGlobalPool::ThreadFromGlobalPool<ThreadPoolImpl<ThreadFromGlobalPool>::scheduleImpl<void>(std::function<void ()>, int, std::optional<unsigned long>)::{lambda()#3}>(ThreadPoolImpl<ThreadFromGlobalPool>::scheduleImpl<void>(std::function<void ()>, int, std::optional<unsigned long>)::{lambda()#3}&&)::{lambda()#1}::operator()() const
|
||
ThreadPoolImpl<std::thread>::worker(std::_List_iterator<std::thread>)
|
||
execute_native_thread_routine
|
||
start_thread
|
||
clone
|
||
```
|